10+ Automatic Data Processing (ADP) Senior Member Technical Interview Questions and Answers

Docker is a containerization platform while Virtual Machine is a virtualization platform.

• Docker shares the host OS kernel while VM has its own OS.

• Docker is lightweight and faster to start than VM.

• Docker containers are portable and can run on any system with Docker installed.

• VMs are more secure as they provide complete isolation from the host system.

• Docker is ideal for microservices architecture while VMs are better for running multiple applications with different OS requireme...read more

String Pool is a cache of String objects. Strings are immutable because their values cannot be changed once created.

• String Pool is a memory area where Java stores String objects to save memory.

• When a new String is created, Java first checks if it already exists in the String Pool. If it does, it returns a reference to the existing object instead of creating a new one.

• Strings are immutable because any operation that modifies a String actually creates a new String object rather...read more

Optimizing SQL queries can improve performance and reduce resource usage.

• Use indexes to speed up data retrieval

• Avoid using SELECT * and instead specify only required columns

• Use JOINs instead of subqueries

• Avoid using functions in WHERE clauses

• Use UNION ALL instead of UNION if possible

• Avoid using temporary tables

• Use EXPLAIN to analyze query performance

ADP is a global provider of cloud-based human capital management solutions that streamline HR, payroll, talent, time, tax and benefits administration.

• ADP provides software and services related to human resource management, payroll processing, tax compliance, and benefits administration

• It offers cloud-based solutions for businesses of all sizes

• ADP's domain is human capital management

• It serves clients in over 140 countries worldwide

• Some of its popular products include ADP Workf...read more

Functional interfaces are interfaces with only one abstract method. Example: java.util.function.Consumer

• Functional interfaces are used in lambda expressions and method references

• They provide a way to pass behavior as an argument to a method

• Examples include java.util.function.Predicate, java.util.function.Supplier

• Functional interfaces can also have default and static methods

Linked List allows dynamic size, efficient insertion/deletion, while Array List has faster access and better cache locality.

• Linked List can grow or shrink dynamically, while Array List has fixed size.

• Insertion and deletion are faster in Linked List as it requires only changing pointers, while Array List requires shifting elements.

• Linked List has better memory utilization as it only allocates memory when needed, while Array List pre-allocates memory.

• Array List has faster acces...read more

An API is a set of rules and protocols that allows different software applications to communicate with each other.

• API stands for Application Programming Interface

• It defines the methods and data formats that applications can use to request and exchange information

• APIs can be used to access services or data from other applications or platforms

• Examples include Google Maps API for integrating maps into a website, Twitter API for accessing tweets, and Spotify API for music streami...read more

The web works by using a client-server model where clients request and receive information from servers via the internet.

• Clients (such as web browsers) send requests for web pages or resources to servers

• Servers process these requests and send back the requested information

• HTTP (Hypertext Transfer Protocol) is commonly used for communication between clients and servers

• Web pages are typically written in HTML (Hypertext Markup Language) and styled with CSS (Cascading Style Sheet...read more

There are 7 layers in the OSI model: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Physical layer deals with physical connections and signals

• Data Link layer handles error detection and correction

• Network layer routes data between different networks

• Transport layer ensures data delivery and error checking

• Session layer establishes, maintains, and terminates connections

• Presentation layer translates data into a format that the application layer can...read more

Find the largest string in a given array of strings

• Iterate through the array and compare the length of each string to find the largest one

• Use a variable to keep track of the largest string found so far

• Return the largest string at the end

The most used technologies during work include Java, Spring Boot, AWS, Docker, and Kubernetes.

• Java

• Spring Boot

• AWS

• Docker

• Kubernetes

Redux is a predictable state container for JavaScript apps.

• Redux is a state management library for JavaScript applications.

• It helps in managing the state of an application in a predictable way.

• Redux stores the entire state of an application in a single immutable object.

• Actions are dispatched to update the state in Redux.

• Reducers specify how the state should change in response to an action.

• Redux is commonly used with React to manage the state of React components.